First of all, there is a name change. It is now Circa Thunder. I'm not sure what Thunder has to do with baseball, but that's what Fleer went with. In fact, isn't thunder a bad thing for baseball?
The set size dropped, too. It was 100 cards smaller than the 1997 set, now down to 300 cards. Finally, the quote by/about the player that was on the front the first two years has been moved to the back.
The card design featured some pretty trippy backgrounds.
Though the set lost 100 cards from 1996, the Cubs lost only one, down to a dozen cards.